Physics ECAT Pre Engineering MCQ's Test For Full Book With Answers

Physics ECAT Pre Engineering MCQ's Test For Full Book

Sr. # Questions Answers Choice
1 In an inelastic collision between two bodies, following is reserved. Energy Both A and B Momentum None
2 Consider two spheres A and B or radii ra and rb both concentric with point charge Q, If ra>rb then the total flux passing normally through the sphere A and B is related as Flux through A is greater Flux through both sphere is equal Flux through a may be greater or less than Q depending on radius Flux through spohere B is greater
3 When using optical fiber in data transmission, the angle of incidence 0i of the light source on the glass fiber should be. Less than critical angle Less than angle of refraction Greater than critical angle Greather than angle of refraction
4 A tight wire is clamped at two points 2 m apart. It is plucked near one end, What are the three longest wavelengths produced on the vibrating wire. 2 m, 1m, 0.67 m 4 m, 2m, 1m 4 m, 2m, 1.33 m 1m, 0.5 m, 0.33 m
5 A truck of mass 5000 kg and a car of mass 1000 kg are both travelling at a speed of 36 km/hr. Assume the time reluired to stop the truck in 10 sec is X difference X and Y is equal to. 4 mega Newton 14.4 Kilo Newton 4 Kilo Newton 14,4 Newton
6 When you drop a ball it acceleerates at 9.8 m/sex. If you instead throw it downward then it accelerates immediately after leaving your hand assuming no air resistance. 9.8 More than 9.8 Less than 9.8 Depending throwing speed
7 A transformer has 100 turns on the imput side 500 turns on the output side. If rms value of input voltage are 220 V and 5A respectively. The output power is? 500 watt 50 watt 1100 watt 1440 watt
8 In circuit X, L = 100 mH and C= 100 meo F are attached in series. In circuit Y, L=100 mH and C= 10 meo G are attached in parallel. The resonating frequency fx and fy are related fx = fy fx=10 fy fx = 0.01 fy Cannot be determined
9 You have 20 inductors available each of 15H. You need an inductor of 1H in a circuit. You achieve it by combination. 15 inductor in parallel 20 inductor in series 20 inductor in parallel 15 inductor in series
10 A police motor cycle running at 140 km/Hr. The apparent frequency heard by the car driver is. Greater than 10 KHZ 10 KHZ Then siren will not be heard Less than 10 KHZ
11 Density of oxygen is about 16 times that of hydrogen therefore if speed of hydrogen is x, then speed of oxygen. Greater than x The same Less than x Depending upon the pressure of gases
12 As the water falls from the tap, the cross sectional area should decrease according to. Bernoulli equation Venture relation Equation of continuity None
13 In amplitude modulation, the amplitude of carrier wave changes in proportion to. The amplitude of the modulating The frequency of the modulating The sign of the modulating All of the above
14 AC voltage is passed through single diode rectifier, the output of the bridge rectifier is. Full wave DC voltage Double frequency AC Voltage Half wave DC voltage None
15 Reception of particular radio station is selected by tuning knob of radio, tuning the tuning knob changes the. Inductance Impedance Capacitance All
16 A thermistor with negative temperature co-efficient is placed in a furnace. When temperature of furnace increases the resistance? Decrease Remain unchanged Increase None of above
17 Moment of linear momentum is called. Moment arm Moment of inertia Inertia Angular momentum
18 Formula for calculating moment of inertia of the bodies of one pair is same. Tick the answer. Disc, sphere sphere, hoop Thin rod, hoop Hoop,disc
19 Final velocity of a hoop is __________ the final velocity of a disc having same mass and radius on coming down an inclined plane. Greater than smaller than Equal to None of these
20 The tidal energy is produced due to rotation of Earth relative to: Moon Sun Oceans Water
21 Most of the geysers occur in: Volcanic regions Magnetic regions Northern region None of these
22 A solar cell is made from: Iron Silicon Germanium Copper
23 The amount of coal used since 1945 up till now as compared to that used in the whole of history before that is Much more Very small No amount at all None of these
24 The tidal energy is due to gravitational pull of : sun moon Mars None of these
25 A solar cell converts energy of the Sun into: Heat energy Magnetic energy Light energy Sound energy
26 The ultimate source of money sources of energy is: Sun Air Water Petroleum
27 If work is done at the rate of 2 k j per second, then total work done is half an hour will be: 0.5 Kwn 2 Kwh 1 Kwh None of these
28 Teh consumption of energy by a 1000 watt heater in half an hour is: 5 Kwh 0.5 Kwh 2.5 Kwh 3.2 Kwh
29 The consumption of energy by a 60 W bulb in 2 minutes is: 2 watt-hour 120 watt-hour 30 watt-hour None of these
30 The power of an electric generating station is expressed in: Kilo Jule Kilowatt-hour Kilo watt Watt
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